I found a really cool sock website several years ago called Sock Dreams. They test and show their socks and stockings on a wide range of leg shapes and sizes and describe their results in the product description. Most of the descriptions report the amount of stretch in the cuff and in the body of the sock.
I don't remember my exact calf size when I found the website, but it had to be at least 22" because I remember there being only a couple of long sock styles that I thought might fit. However, there were a lot of styles that were described as falling knee high or longer on 19" calves.
I think I was maybe 12 years old the last time I was able to find knee high socks that actually reached my knees. I've occasionally been able to find sheer, plus sized, nylon, trouser socks to fit, but not opaque "sock" socks.
I decided that when my calves measured 19" or less, I would order some long socks, knee high or higher.
They do, and I did (to the tune of five pair and $50. Standard shipping is free within the USA.
They arrived yesterday (I ordered them on Saturday).
I ordered the Dreamer Diamond Wave and Dreamer Palm OTK both in charcoal and the O Basics style in charcoal, natural, and teal (among the colors reported to fit a 19" calf).
Since I'm a bit of a cheapskate, spending $50 on socks was almost heartstopping, but I am so happy I did. I LOVE these socks. The O Basics make a great cuffed or scrunched knee sock and the Dreamer pairs can be cuffed, but I don't have too. They're the first OTK socks I've ever had.
I was hoping the size guidelines were generous, but they're pretty much dead-on, so I'm glad I didn't buy any of the socks recommended only up to 18" or before my calves had reached 19".
I think I could easily become sock-addicted. I'm already planning my selections for when I lose another inch in my calves (as more styles choices will be available).
I would never guessed that I could be so excited about socks.